Any of its multiples
H.C.F stands for highest common factor. That means the highest number which is a factor of all the numbers, that is the highest number that divides all the numbers without remainder. As such, it is just a number with no units.
It is the first whole number divided by the denominator of the unit fraction. This could be a whole number or a fraction.
A unit rate cannot have a remainder. A unit rate is a ration that has the unit as one and the rate has to be equal. If not, you either did a calculation mistake or the ratio is not a unit rate.
The missing number is 1000000 (a million).
Weighted Average
The smallest unit,usually consisting of a group of atoms,into which a substance can be divided without a change in its chemical nature.
93.06
It depends on what the divisor is. "Remainder 6" is a contemporary unit and fluctuates depending on how much you're dividing the number by. For example, 20 / 7 = 2 R6 = 26/7, but 28 / 11 = 2 R6 = 26/11.
Efficiency is a dimensionless quantity, i.e. it's just a number, without any unit.
You can't convert between a number without a unit, to a unit.
A pure dimensionless (without units) number is never equivalent to a number with a unit.
The contribution per machine hour is the contribution per unit divided by the number of machine hours per unit.